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the term ascribed to an upward trend
'''Global warming''' is the term ascribed to an increase in the [[global mean temperature]]. Average [[Earth]] surface air temperature has risen just over 1 °C since 1850.
'''Global warming''' is the term ascribed to an upward trend in the [[global mean temperature]]. Average [[Earth]] surface air temperature has risen just over 1 °C since 1850.
<ref>Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F] in the past century." http://data.giss.nasa.gov/gistemp/2005/</ref>
<ref>Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6 °C [1.0 °F] in the past three decades and 0.8 °C [1.4 °F] in the past century." http://data.giss.nasa.gov/gistemp/2005/</ref>
The focus of the science surrounding global warming has been to determine whether it is the result the natural internal variability of the climate, or due to other influences such as solar or human activity.
The focus of the science surrounding global warming has been to determine whether it is the result the natural internal variability of the climate, or due to other influences such as solar or human activity.